Calculate the 90% confidence interval for a sample of N = 29 with a mean 
= 137.98 and standard deviation (s) = 26.84.
a. 90% CI = 137.98 ± 8.47
b. 90% CI = 137.98 ± 13.76
c. 90% CI = 137.98 ± 6.68
d. 90% CI = 137.98 ± 10.20
a. 90% CI = 137.98 ± 8.47
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